Zotero adds "invisible spaces" before footnote in Word

Hi all!

For some of the footnotes in my document, all of sudden weird spaces appear. It looks like as if there is some extra space between the end of the sentence and the number that refers to the footnote.

When I click to that space the cursor is partly gone. I can only see a small bit of the lower parts of the cursor.

I can delete these "spaces" by pressing the delete button repeatedly (5-11 times, it varies).

When I click on "show paragraph marks" I don't see any white space between the end of the sentence and the footnote.

Has anyone encountered a similar problem?

I use
ZOTERO 2.0b7.6
MS WORD 2007 for windows
ZOTERO WinWird Integration 3.0a3

Thanks for any leads you could provide!
Matthias

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